//
// Copyright (c) Microsoft Corp. (https://www.microsoft.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using Microsoft.VisualStudio.Utilities;

namespace Microsoft.VisualStudio.Text.Editor
{
	sealed class ProjectionTextDataModel : ITextDataModel
	{
		public ProjectionTextDataModel (ITextBuffer diskBuffer, ITextBuffer projectedBuffer = null)
		{
			projectedBuffer = projectedBuffer ?? diskBuffer ?? throw new ArgumentNullException (nameof (diskBuffer));
			DataBuffer = projectedBuffer;
			DocumentBuffer = diskBuffer;
			diskBuffer.ContentTypeChanged += OnDocumentBufferContentTypeChanged;
		}

		public event EventHandler<TextDataModelContentTypeChangedEventArgs> ContentTypeChanged;

		public ITextBuffer DocumentBuffer { get; }
		public ITextBuffer DataBuffer { get; }

		public IContentType ContentType => DocumentBuffer.ContentType;

		private void OnDocumentBufferContentTypeChanged (object sender, ContentTypeChangedEventArgs e)
		{
			ContentTypeChanged?.Invoke (this, new TextDataModelContentTypeChangedEventArgs (e.BeforeContentType, e.AfterContentType));
		}
	}
}
